
// CPU specific code for ia32 independent of OS goes here.

#ifdef __GNUC__
#include "third_party/valgrind/valgrind.h"
#endif

#include "cpu.h"
#include "assembler-ia32.h"

namespace cgen {
namespace internal {

void CPU::Setup()
{
    CpuFeatures::Probe();
}


void CPU::FlushICache(void* start, size_t size)
{
  // No need to flush the instruction cache on Intel. On Intel instruction
  // cache flushing is only necessary when multiple cores running the same
  // code simultaneously. V8 (and JavaScript) is single threaded and when code
  // is patched on an intel CPU the core performing the patching will have its
  // own instruction cache updated automatically.

  // If flushing of the instruction cache becomes necessary Windows has the
  // API function FlushInstructionCache.

  // By default, valgrind only checks the stack for writes that might need to
  // invalidate already cached translated code.  This leads to random
  // instability when code patches or moves are sometimes unnoticed.  One
  // solution is to run valgrind with --smc-check=all, but this comes at a big
  // performance cost.  We can notify valgrind to invalidate its cache.
#ifdef VALGRIND_DISCARD_TRANSLATIONS
  VALGRIND_DISCARD_TRANSLATIONS(start, size);
#endif
}


void CPU::DebugBreak() {
#ifdef _MSC_VER
  // To avoid Visual Studio runtime support the following code can be used
  // instead
  // __asm { int 3 }
  __debugbreak();
#else
  asm("int $3");
#endif
}

} }  // namespace cgen::internal
